The K9-85 MCW from Visonic is a PowerCode wireless digital Passive Infrared (PIR) sensor that allows you to secure your home while allowing pets to move freely. Using Visonic's patented "Target Specific Imaging" optical system and unique pet identification software algorithm, the K9-85 has an unprecedented capacity to reliably distinguish between human bodies and pets weighing up to 85lb (38 kg). This sensor is a fully supervised wireless detector with anti-collision PowerCode technology. It is compatible with PowerMax and all Visonic PowerCode wireless panels and receivers.

The K9-85 MCW implements a whole new generation of patented technologies including FM Digital Signal Processing (FM-DSP), "True "Motion Recognition" with Fuzzy Logic algorithm" (TMR), and state-of-the-art 3D cylindrical optics. The result is the industry's best detection accuracy, false alarm immunity, and ultimate long term reliability - in an attractive, easily installed wireless detector designed for any pet-loving home environment.

I have two PIR K9-85 MCW detectors. Neither of them works when temperature falls below 5 C 41 F. Does anybody have that problem?

Posted on 11/10/2013

Review of 73946 Review by jdeg

Review of 73946jdeg

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I have two of these sensors and unfortunately I rarely use them because my cat will set them off. The one near my front door also points at the steps, and I was told that an animal coming down the steps is what would set them off. There is no other way I could configure the sensor to not point at the steps though, while still monitoring the front door.

Posted on 7/17/2012

Review of 73946 Review by GUNNAR

Review of 73946GUNNAR

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Has the RF ID code on the label so it is compatible with the Visonic Amber Selectx as sold by Smarthome. The "PERS" designation should be added to the model number so it is clear the RF ID code is there, as is the case on the Visonic Web Product site.

Posted on 12/21/2011

Review of 73946 Review by Cliff

Review of 73946Cliff

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I've had three in use for nearly a year. I have yet to get a false alarm and we have pets. One is out in the yard at a storage shed and appx. 50 feet from the control panel through 3 inside walls and one external brick wall. And here in Ohio we have wide extremes in temperature 0 F to 95 F. All sensors have worked flawlessly. I can't imagine a simpler or easier to install motion detector. However, as I said in an earlier review, you can't mount it high in a corner of a room because the screw to open up the unit and change the battery is on top, so you need room to get a screwdriver in there above it. I suppose you could install it upside down but that may affect its function.

Posted on 8/23/2011

Review of 73946 Review by MARK

Review of 73946MARK

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Just needed an extra. It works like the others.

Posted on 4/28/2011

Review of 73946 Review by Ray

Review of 73946Ray

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I have three of these in my system, the one that I am writing about is in my garage, its furthest one from the panel and the signal has to go through two walls in my home, and if I don't disarm the alarm before I go into the gurage it will set it into alarm, so I know they work very well, and easy to enroll into the systm.

Posted on 4/19/2011

Review of 73946 Review by RAY

Review of 73946RAY

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I have several and they all work as advertised.

Posted on 2/19/2011

Review of 73946 Review by RAYMOND

Review of 73946RAYMOND

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I have successfully and happily installed two of these elsewhere in my home, both relatively close to the central station. The 3rd one has been nothing but problems. Its location is the furthest wireless device from the central unit, but still only about 30 paces from the unit, but through a bunch of twist and turns through hallways. Originally I thought I had a defective unit, but after receiving two replacement units from Smarthome I've concluded that the device just doesn't work too well when it doesn't have a clear path to send its signal. What makes the process more frustrating is the misleading error messages and symptoms you get. In conclusion, when close and clear lines, read less than 20 feet, it works very well. Beyond that and it is very unreliable. After 3 different units I think it is safe to say it is not an anomaly.

Posted on 1/19/2011

Review of 73946 Review by CLIFF

Review of 73946CLIFF

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You can't mount the unit in the top corner of a wall because to change the battery you have to remove the screw at the top of the unit. Engineering issue. But it works fine and the pet-immune filter works perfectly!